And I didn't think of Ingrid as being very similar to Sandra, but I guess Sandra saying that puts Cammi neatly on the spot.

I don't think Sandra means that Ingrid is like her. The turn of phrase she used makes me think she doesn't like that Cammy is dating another woman period. She sounds a bit jealous. But I could be wrong.

"Hi. I'm NG Resonance. What would you like to talk about?"
"I like your music."
"I think you're lying."
"Hey -- I'm a fan. You're not supposed to argue with me."
"I'm supposed to make you like me. You like it when I argue."

I read it as meaning that, like Sandra, Ingrid is also a woman. I see it as Sandra just trying to get her mind wrapped around the sight of Cammi dating another woman. I don't think it goes any deeper than that.

Okay. I guess that just about works. The idea that even a startled Sandra would feel obliged to point out that she herself is a woman seems a bit weird, but I guess that may be all she means.

(The other question might be how she could tell that the other two were on a date. Surely, even Cammi can give someone a lift on her bike without it automatically being a date. It seems like a scene being slightly overly compressed here.)

I read it as meaning that, like Sandra, Ingrid is also a woman. I see it as Sandra just trying to get her mind wrapped around the sight of Cammi dating another woman. I don't think it goes any deeper than that.